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Despite this behavioral evidence, there have been few ERP studies of singleton detection mode because it was reported early on that the ERP signature of attentional selection (the N2pc) is absent without feature guidance. Recently, however, it was discovered that a small and relatively late N2pc occurs in singleton detection mode along with a previously unreported component called the singleton detection positivity (SDP). Here, we show that both components are influenced by the number of items in the display, as one might expect in a salience-based search mode. Specifically, the N2pc and SDP were larger when the set size was increased to make the singleton \u201cpop out\u201d more easily, when participants responded more quickly regardless of set size, and when RT search slopes were negative (Experiment 1). The latency of the SDP also depended on set size. In Experiment 2, EEG was recorded with a higher density electrode array to better characterize the scalp topography of the components and to estimate their neural sources. Regional sources near the ventral surface of extrastriate cortex in the occipital lobe explained over 96% of N2pc and SDP activities. These results indicate that searching in singleton detection mode selectively modulates processing within perceptual regions of visual cortex.<\/jats:p>","DOI":"10.1162\/jocn_a_01890","type":"journal-article","created":{"date-parts":[[2022,7,8]],"date-time":"2022-07-08T17:37:10Z","timestamp":1657301830000},"page":"2127-2143","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":9,"title":["Searching for Visual Singletons Without A Feature to Guide Attention"],"prefix":"10.1162","volume":"34","author":[{"given":"Daniel","family":"Tay","sequence":"first","affiliation":[{"name":"Simon Fraser University, Burnaby, British Columbia, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David L.","family":"McIntyre","sequence":"additional","affiliation":[{"name":"Simon Fraser University, Burnaby, British Columbia, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John 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